QUESTION 2 (a) Using the aid of schematic and T - s diagram, explain how regeneration cam improve the thermal efficiency of gas turbine working on Brayton cycle. (b) An aircraft engine operates on a simple ideal Brayton cycle with a pressure ratio of 10. Heat is added to the cycle at a rate of 500 kW; air passes through the engine at a rate of 1 kg/s; and the air at the beginning of the compression is at 70 kPa and 0°C. Evaluate the power produced by this engine and its thermal efficiency. Use constant specific heat at room temperature.

QUESTION 2 (a) Using the aid of schematic and T - s diagram, explain how regeneration cam improve the thermal efficiency of gas turbine working on Brayton cycle. (b) An aircraft engine operates on a simple ideal Brayton cycle with a pressure ratio of 10. Heat is added to the cycle at a rate of 500 kW; air passes through the engine at a rate of 1 kg/s; and the air at the beginning of the compression is at 70 kPa and 0°C. Evaluate the power produced by this engine and its thermal efficiency. Use constant specific heat at room temperature.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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For a ideal Rankine cycle, increasing maximum pressure while holding all other parameters constant will allow an engineer to make the following statements Group of answer choices Increasing maximum pressure will increase the average temperature at which heat is added and therefore increase efficiency The quality at the turbine exit will increase, reducing liquid water content at the turbine exit The quality at the turbine exit will decrease, increasing liquid water content at the turbine exit The back stages of the turbine could face erosion damage due to increase liquid water content. Increasing maximum pressure will decrease the average temperature at which heat is added and therefore increase efficiency
3. An air-standard Otto cycle operates with a compression ratio of 8 and a maximum temperature per cycle of 1400 K. If the temperature and pressure at the beginning of compression stroke are 300 K and 100 kPa respectively, determine the following assuming air to be an ideal gas with constant specific heats Cp = 1.005 kJ/kg K and Cv = 0.718 kJ/kg K: (a) The heat supplied (b) The work produced (c) The thermal efficiency.
H.W2: An air-standard Carnot cycle is executed in a closed system between the temperature limits of 350 and 1200 K. The pressures before and after the isothermal compression are 150 and 300 kPa, respectively. If the net work output per cycle is 0.5 kJ, determine (a) the maximum pressure in the cycle, (b) the heat transfer to air, and (c) the mass of air. Assume variable specific heats for air. Answers: (a) 30,013 kPa, (b) 0.706 kJ, (c) 0.00296 kg
Topic: Review of steam cycles Completely solve (a) to (e).
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